sem: don't map parenthesis of literals; fix bblfsh#56

Parenthisized literals result in this information saved
in 'extra' field.

Signed-off-by: Alexander Bezzubov <bzz@apache.org>

driver/normalizer/normalizer.go

@@ -37,9 +37,12 @@ var Preprocessors = []Mapping{
 		Part("_", Obj{
 			uast.KeyType: String("StringLiteral"),
 			"value":      AnyNode(nil),
-			"extra": Obj{
-				"raw":      Var("raw"),
-				"rawValue": AnyNode(nil),
+			"extra": Fields{
+				{Name: "raw", Op: Var("raw")},
+				{Name: "rawValue", Op: Any()},
+				//FIXME(bzz): map parenthesis
+				{Name: "parenthesized", Drop: true, Op: Any()},
+				{Name: "parenStart", Drop: true, Op: Any()},
 			},
 		}),
 		Part("_", Obj{
@@ -50,8 +53,11 @@ var Preprocessors = []Mapping{
 	Map(
 		Part("_", Obj{
 			uast.KeyType: String("RegExpLiteral"),
-			"extra": Obj{
-				"raw": Var("raw"),
+			"extra": Fields{
+				{Name: "raw", Op: Var("raw")},
+				//FIXME(bzz): map parenthesis
+				{Name: "parenthesized", Drop: true, Op: Any()},
+				{Name: "parenStart", Drop: true, Op: Any()},
 			},
 		}),
 		Part("_", Obj{
@@ -61,7 +67,7 @@ var Preprocessors = []Mapping{
 	),
 	// drop extra info for other nodes (it duplicates other node fields)
 	Map(
-		Part("_", Obj{"extra": AnyNode(nil)}),
+		Part("_", Obj{"extra": Any()}),
 		Part("_", Obj{}),
 	),
 	// FIXME(bzz): make sure such comments are mapped properly

fixtures/issue56.js

@@ -0,0 +1,3 @@
+this._dayOfMonthOrdinalParseLenient = new RegExp(
+    (this._dayOfMonthOrdinalParse.source || this._ordinalParse.source) +
+        '|' + (/\d{1,2}/).source);